Unit 4 Assignment 1: MTTR Measurements of Information Availability (IA) Scenario: A company has three (3) components in a system and requires all three to be operational for 24 hours, Monday to Friday. Failure of component 1 occurs as follows: Monday = No failure. Tuesday = 5 a.m. to 7 a.m. Wednesday = No failure. Thursday = 4 p.m. to 8 p.m. Friday = 8 a.m. to 11 a.m. Directions: Using the scenario above, respond to the items below. Calculate the MTBF (Mean Time Between Failures) and MTTR of component 1. Show your steps of how you calculated the MTBF. Steps: 1. MTBF = Total Uptime / Number Failures Total Uptime = (Number of Days Required Operational x Hours per Day Available) - Number of Hours Not Available 2. MTTR = Total Downtime / Number of Failures For one component: Total production time (up time + down time) = 111 Total down time = Number of breakdowns = 9 3*1=3 Total: MTBF = 34 hours MTTR = 3 hours For three components: Total production time (up time + down time) = 111 Total down time = Number of breakdowns = 9 3*3=9 Total: MTBF = 11 hours MTTR = 1 hour What does the MTBF measurement tell you about the goal of having 99.999% uptime or Information Availability on system components? The percentage uptime achieved per year. Given this definition, the maximum downtime permitted per year may be calculated as reflected above. Because it is a fraction of time spent in the \"available\" state, the value can never exceed the bounds of 0 < A < 1. Thus, availability will most often be written as a decimal, as in 0.99999, as a percentage, as in 99.999%, or equivalently spoken, \"five nines of availability.\" Mean Time Between Failure (MTBF): It is the average time available for a system or component to perform its normal operations between failures. It is the measure of system or component reliability and is usually expressed in hours. Mean Time To Repair (MTTR): It is the average time required to repair a failed component. While calculating MTTR, it is assumed that the fault responsible for the failure is correctly identified and the required spares and personnel are available. A fault is a physical defect at the component level, which may result in information unavailability. MTTR includes the total time required to do the following activities: Detect the fault, mobilize the maintenance team, diagnose the fault, obtain the spare parts, repair, test, and restore the data